You're the one who's dumb if you think being agile means a thing against something that could flatten you like a pancake!

Besides, if I was dumb, I wouldn't be able to come up with half of my sinister schemes! Or build fortresses full of traps and my own personal air ships.

[Granted, he probably doesn't build all of them, but the Koopa King definitely has a hand in it. Gwahahaha!]